Here are several reasons.
Firstly, N42 series are the perfect balance between cost, strength, and performance. It falls in the middle range of the low-to-high magnet grades and offers the best cost-effective solution. Interestingly, in some cases, N42 magnets may even be stronger than N52, especially when the magnet shape is thin.
Additionally, the N42 has better temperature resistance than the N50, N52 and N55, which have a maximum operating temperature of 80°C, compared to 60°C for the N50, N52 and N55. Alternatively, if more temperature resistance is required, we can choose N42SH, which has an operating temperature of 300 degrees Fahrenheit (150 degrees Celsius) and is stronger and cheaper than other types of high temperature magnets, such as SmCo, AlniCo and ceramic magnets. It is suitable for use in a wide range of high temperature industrial applications.
Moreover, N42 is an ideal choice for beginners who are starting a new project that requires neodymium magnets. It is difficult to find the right magnet grade immediately among many properties. As you have to work through a variety of magnets to find a balance between size and pull strength. But grade N42 is a good start to have sample test easily.
Furthermore, N42 is widely available and frequently sold in online shops. Customers can easily find a wide range of N42 magnet sizes and shapes, such as blocks, discs, rings, or countersunk magnets, to suit their needs. However, it is worth noting that custom-shaped magnets, such as arc-shaped magnets, need to be specially produced by magnet manufacturers.
Lastly, N42 magnets offer great flexibility as they can provide the same strength as an N50 magnet by using a slightly larger N42 magnet or the same strength as an N38 magnet by using a slightly smaller N42 magnet. However, for those seeking the highest strength in the smallest possible size at room temperature, N52 or N55 is the strongest option available.
In conclusion, N42 neodymium magnets are a fantastic choice due to their cost-effectiveness, durability, availability, ease of use, and flexibility. When choosing a magnet grade for a specific application, N42 is an excellent starting point that provides reliable and consistent performance.